# File lib/zip/zip_extra_field.rb, line 62
      def merge(binstr)
        return if binstr.empty?
        size, content = initial_parse(binstr)
        size or return
        @flag, mtime, atime, ctime = content.unpack("CVVV")
        mtime and @mtime ||= DOSTime.at(mtime)
        atime and @atime ||= DOSTime.at(atime)
        ctime and @ctime ||= DOSTime.at(ctime)
      end